Stackable chair



FIG. 1 is a perspective view of my ornamental design for a stackable chair;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view thereof, the right and left sides being identical mirror images thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is perspective view of another embodiment of my ornamental design for a stackable chair;

FIG. 8 is a front elevational view thereof;

FIG. 9 is a rear elevational view thereof;

FIG. 10 is a side elevational view thereof, the right and left sides being identical mirror images thereof;

FIG. 11 is a top view thereof; and,

FIG. 12 is a bottom view thereof. 

The ornamental design for a stackable chair, as shown and described. 